Calcified Tissue International

, Volume 79, Issue 5, pp 294–300 | Cite as

Dentin Alteration of Deciduous Teeth in Human Hypophosphatemic Rickets

  • T. Boukpessi
  • D. Septier
  • S. Bagga
  • M. Garabedian
  • M. Goldberg
  • C. Chaussain-Miller
Article

Abstract

Familial hypophosphatemic rickets is in most cases transmitted as an X-linked dominant trait and results from mutation of the PHEX gene, predominantly expressed in osteoblast and odontoblast. Patients have been reported to display important dentin defects, and therefore, we explored the dentin structure, composition, and distribution of extracellular matrix (ECM) molecules in hypophosphatemic human deciduous teeth. Compared to age-matched controls, the dentin from hypophosphatemic patients exhibited major differences: presence of large interglobular spaces resulting from the lack of fusion of calcospherites in the circumpulpal dentin; defective mineralization in the interglobular spaces contrasting with normal Ca-P levels in the calcospherites on X-ray microanalysis; abnormal presence of low-molecular weight protein complexes recognized on Western blots by antibodies against matrix extracellular phosphoglycoprotein (MEPE), dentin sialoprotein, osteopontin, and reduced osteocalcin (OC) level; and accumulation in the interglobular spaces of immunolabeling with antibodies against DSP, dentin matrix protein, bone sialoprotein, MEPE and OC, while chondroitin/dermatan sulfate glycosaminoglycans were exclusively located inside calcospherites. Alterations of the post-translational processing or partial degradation of some ECM appear as key factors in the formation of the defective hypophosphatemic dentin.

Keywords

X-linked hypophosphatemia Dentin mineralization Interglobular space Non-collagenous protein 

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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • T. Boukpessi
    • 1
  • D. Septier
    • 1
  • S. Bagga
    • 2
  • M. Garabedian
    • 3
  • M. Goldberg
    • 1
  • C. Chaussain-Miller
    • 1
  1. 1.Laboratoire Réparation et Remodelage des Tissus Oro-Faciaux, EA 2496 Groupe Matrices extracellulaires et biominéralisations, Faculté de Chirurgie DentaireUniversité University Paris 5MontrougeFrance
  2. 2.Faculté de Chirurgie Dentaire de MonastirTunisie
  3. 3.Department of Pediatric Endocrinology and INSERM U561Hôpital St. Vincent de PaulParisFrance

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